Prediction of nontrivial band topology and superconductivity in Mg2Pb
Guang Bian, Tay-Rong Chang, Angus Huang, Yuwei Li, Horng-Tay Jeng, David J. Singh, Robert J. Cava, Weiwei Xie
DOI 10.1103/PhysRevMaterials.1.021201 · Physical Review Materials
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Abstract
The interplay of BCS superconductivity and nontrivial band topology is expected to give rise to opportunities for creating topological superconductors, achieved through pairing spin-filtered boundary modes via superconducting proximity effects. The thus-engineered topological superconductivity can, for example, facilitate the search for Majorana fermion quasiparticles in condensed matter systems. Here we report a first-principles study of Mg2Pb and predict that it should be a superconducting topological material. The band topology of Mg2Pb is identical to that of the archetypal quantum spin Hall insulator HgTe, while isostructural and isoelectronic Mg2Sn is topologically trivial; a trivial-to-topological transition is predicted for Mg2Sn1−xPbx for x≈0.77. We propose that Mg2Pb–Mg2Sn quantum wells should generate robust spin-filtered edge currents in analogy to HgTe/CdTe quantum wells. In addition, our calculations predict that Mg2Pb should become superconducting upon electron doping. Therefore, Mg2Pb is expected to provide a practical material platform for studying emergent phenomena arising from the interplay of superconductivity and band topology.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mg2Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.002 | Pressure not reported | unknown |
| Mg2Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | unknown |
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